Originally Posted by
19taco78
I would like to use my Global Premier Upgrades on a IAH BKK during November or December with a lot of flexibility on the dates. Any advice on how to maximize the chances of getting a upgrade?
Use "expert mode" or ExpertFlyer to find flights with open upgrade space**, book the ticket, and apply the GPU immediately after ticketing. Expert mode is a little tougher, as you have to search day by day. Then again, you can look for award business, and use the logic that open C might mean open upgrades to C. That way you can look for a month out.
There's room on 11/19 - IAH-SFO-NRT-BKK.
**Plenty of threads here about finding upgrade space segment by segment. I don't like the "mileage upgrade award" button - too limiting.